Chemistry

A) determine the mass of sodium hydroxide needed to prepare 100ml of 0.5M standard solution
B) describe the procedure used to prepare the standard solution
C) use the 100ml stock solution of 0.5M sodium hydroxide to neutralize H2SO4 by volumetric analysis I) Calculate the average volume of H2SO4
II)State the PH indicator used to the acid base reaction
III) Explain how rough titration is done
IV) Calculate the concentration of H2SO4 that can be neutralised by 25cm3 of 0.5M of sodium hydroxide